/* ============================================================
   Clash官网 · 「晨雾玻璃」设计系统 —— 组件层 components.css
   内容：tab / toc 分类导航 / FAQ 折叠 / 术语卡 / 下载卡 /
         博客文章卡 / callout / dl-fab 浮层 /
         特性索引台 / 连接状态玻璃卡
   依赖 base.css 中的 :root 设计令牌
   ============================================================ */

/* ---------- 1. Tab 切换 ---------- */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 6px;
  background: var(--c-panel-2);
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
  width: fit-content;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.tabs [role="tab"] {
  border: none;
  background: transparent;
  padding: 9px 20px;
  border-radius: var(--r-pill);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  color: var(--c-ink-mute);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.3s, color 0.3s, box-shadow 0.3s;
}

.tabs [role="tab"]:hover { color: var(--c-accent); }

.tabs [role="tab"][aria-selected="true"] {
  background: var(--c-panel);
  color: var(--c-accent-deep);
  font-weight: 600;
  box-shadow: var(--shadow-hush);
}

.tab-panel { display: none; }

.tab-panel.is-live {
  display: block;
  animation: panel-in 0.45s var(--ease-drift);
}

@keyframes panel-in {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 2. 长页分类跳转导航 toc ---------- */
.toc-rail {
  position: sticky;
  top: 66px;
  z-index: 40;
  background: var(--glass-fill);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-line);
  border-radius: var(--r-pill);
  padding: 7px;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  max-width: 100%;
  box-shadow: var(--shadow-hush);
}

.toc-rail::-webkit-scrollbar { display: none; }

.toc-rail a {
  display: inline-block;
  padding: 8px 18px;
  border-radius: var(--r-pill);
  font-size: 13.5px;
  color: var(--c-ink-mute);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background 0.25s, color 0.25s;
}

.toc-rail a:hover {
  background: var(--accent-soft);
  color: var(--c-accent-deep);
}

/* ---------- 3. FAQ 折叠项 ---------- */
.faq-item {
  background: var(--glass-fill);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-line);
  border-radius: var(--r-md);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.faq-item[open] {
  border-color: var(--accent-mist);
  box-shadow: var(--shadow-hush);
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 17px 22px;
  display: flex;
  align-items: center;
  gap: 14px;
  font-weight: 600;
  font-size: 15.5px;
  color: var(--c-ink);
  -webkit-user-select: none;
  user-select: none;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "";
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--c-ink-mute);
  border-bottom: 2px solid var(--c-ink-mute);
  transform: rotate(45deg);
  margin-left: auto;
  flex-shrink: 0;
  transition: transform 0.3s var(--ease-drift);
}

.faq-item[open] summary::after {
  transform: rotate(-135deg);
  border-color: var(--c-accent);
}

.faq-item summary:hover { color: var(--c-accent); }

.faq-body {
  padding: 0 22px 20px;
  color: var(--c-ink-mute);
  font-size: 14.5px;
  line-height: 1.85;
}

.faq-body p:last-child { margin-bottom: 0; }

.faq-group { margin-bottom: clamp(36px, 5vw, 56px); scroll-margin-top: 140px; }

.faq-group > h2 {
  display: flex;
  align-items: center;
  gap: 12px;
}

.faq-group > h2::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--c-accent);
  flex-shrink: 0;
}

/* ---------- 4. 术语卡 ---------- */
.term-card {
  background: var(--glass-fill);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-line);
  border-radius: var(--r-md);
  padding: 20px 22px;
  min-width: 0;
  transition: transform var(--dur-soft) var(--ease-drift), border-color 0.3s;
  scroll-margin-top: 140px;
}

.term-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-mist);
}

.term-name {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 8px;
}

.term-name code {
  font-size: 15px;
  font-weight: 700;
  color: var(--c-accent-deep);
  background: var(--accent-soft);
  border-radius: 7px;
  padding: 3px 10px;
}

.term-cat {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-ink-mute);
  text-transform: uppercase;
}

.term-card p {
  margin: 0;
  font-size: 14px;
  color: var(--c-ink-mute);
  line-height: 1.8;
}

.term-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.term-grid > * { min-width: 0; }

/* ---------- 5. 下载客户端卡片 ---------- */
.dl-card {
  background: var(--glass-fill-strong);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-line);
  border-radius: var(--r-lg);
  padding: 24px 26px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
  position: relative;
  transition: transform var(--dur-soft) var(--ease-drift), box-shadow var(--dur-soft), border-color 0.3s;
}

.dl-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-float);
  border-color: var(--accent-mist);
}

.dl-card.is-featured { border-color: var(--accent-mist); }

.dl-card.is-featured::before {
  content: "推荐";
  position: absolute;
  top: -11px;
  right: 20px;
  background: var(--c-accent);
  color: var(--c-panel);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 3px 13px;
  border-radius: var(--r-pill);
}

.dl-head {
  display: flex;
  align-items: center;
  gap: 12px;
}

.dl-head svg { flex-shrink: 0; color: var(--c-accent); }

.dl-head h3 { margin: 0; font-size: 17px; }

.dl-desc {
  font-size: 13.5px;
  color: var(--c-ink-mute);
  margin: 0;
  line-height: 1.75;
}

.dl-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-ink-mute);
}

.dl-meta .dl-ver { color: var(--c-ok); }

.dl-actions {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.dl-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 20px;
}

.dl-grid > * { min-width: 0; }

/* 平台锚点分区 */
.dl-platform { scroll-margin-top: 140px; margin-bottom: clamp(36px, 5vw, 60px); }

/* ---------- 6. 博客文章卡 ---------- */
.post-card {
  background: var(--glass-fill);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-line);
  border-radius: var(--r-lg);
  padding: 24px 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
  transition: transform var(--dur-soft) var(--ease-drift), box-shadow var(--dur-soft), border-color 0.3s;
}

.post-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-float);
  border-color: var(--accent-mist);
}

.post-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-ink-mute);
}

.post-tag {
  display: inline-block;
  padding: 3px 12px;
  border-radius: var(--r-pill);
  background: var(--accent-soft);
  color: var(--c-accent);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.post-card h3 { margin: 0; font-size: 17px; line-height: 1.45; }

.post-card h3 a {
  color: var(--c-ink);
  text-decoration: none;
}

.post-card h3 a:hover { color: var(--c-accent); }

.post-card .post-sum {
  margin: 0;
  font-size: 14px;
  color: var(--c-ink-mute);
  line-height: 1.8;
}

.post-more {
  margin-top: auto;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--c-accent);
  text-decoration: none;
}

.post-more:hover { color: var(--c-accent-deep); }

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.post-grid > * { min-width: 0; }

/* ---------- 7. callout 引用块 ---------- */
.callout {
  display: flex;
  gap: 14px;
  padding: 16px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--c-line);
  border-left: 3px solid var(--c-accent);
  background: var(--accent-soft);
  margin: 20px 0;
  font-size: 14.5px;
  line-height: 1.8;
}

.callout > svg,
.callout > .co-icon {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--c-accent);
}

.callout p { margin: 0; }

.callout p + p { margin-top: 8px; }

.callout strong { color: var(--c-ink); }

.callout.is-ok {
  border-left-color: var(--c-ok);
  background: var(--ok-soft);
}

.callout.is-ok > svg, .callout.is-ok > .co-icon { color: var(--c-ok); }

.callout.is-warn {
  border-left-color: var(--c-warn);
  background: var(--warn-soft);
}

.callout.is-warn > svg, .callout.is-warn > .co-icon { color: var(--c-warn); }

.callout.is-err {
  border-left-color: var(--c-err);
  background: var(--err-soft);
}

.callout.is-err > svg, .callout.is-err > .co-icon { color: var(--c-err); }

/* ---------- 8. dl-fab 右下角下载引导浮层 ---------- */
.dl-fab {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 55;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 12px 22px;
  border-radius: var(--r-pill);
  background: var(--c-accent);
  color: var(--c-panel);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  box-shadow: var(--shadow-float);
  transition: transform 0.3s var(--ease-drift), background 0.3s;
}

.dl-fab:hover {
  background: var(--c-accent-deep);
  color: var(--c-panel);
  transform: translateY(-3px);
}

.dl-fab svg { flex-shrink: 0; }

@media (max-width: 640px) {
  .dl-fab { padding: 11px 17px; font-size: 13px; }
}

/* ---------- 9. 「玻璃索引台」特性布局 ---------- */
.feat-stage {
  display: grid;
  grid-template-columns: minmax(200px, 264px) minmax(0, 1fr);
  gap: var(--gap-panel);
  align-items: stretch;
}

.feat-stage > * { min-width: 0; }

.feat-index {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 0;
}

.feat-index [role="tab"] {
  display: flex;
  align-items: center;
  gap: 13px;
  border: none;
  background: transparent;
  text-align: left;
  padding: 13px 16px;
  border-radius: var(--r-sm);
  cursor: pointer;
  color: var(--c-ink-mute);
  font-family: var(--font-display);
  font-size: 14.5px;
  font-weight: 500;
  position: relative;
  transition: transform 0.35s var(--ease-drift), color 0.3s, background 0.3s;
}

.feat-index [role="tab"] .feat-no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-ink-mute);
  flex-shrink: 0;
}

.feat-index [role="tab"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%) scaleY(0);
  width: 3px;
  height: 22px;
  border-radius: 3px;
  background: var(--c-accent);
  transition: transform 0.35s var(--ease-drift);
}

.feat-index [role="tab"]:hover { color: var(--c-accent); }

.feat-index [role="tab"][aria-selected="true"] {
  color: var(--c-accent-deep);
  font-weight: 600;
  transform: translateX(8px);
  background: var(--accent-soft);
}

.feat-index [role="tab"][aria-selected="true"]::before {
  transform: translateY(-50%) scaleY(1);
}

.feat-index [role="tab"][aria-selected="true"] .feat-no { color: var(--c-accent); }

.feat-panel-shell {
  position: relative;
  background: var(--glass-fill-strong);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-float);
  padding: clamp(24px, 3.5vw, 40px);
  overflow: hidden;
  min-height: 300px;
}

.feat-panel { display: none; }

.feat-panel.is-live {
  display: block;
  animation: panel-in 0.5s var(--ease-drift);
}

.feat-panel h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }

.feat-panel p { color: var(--c-ink-mute); }

.feat-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: 100%;
  background: var(--c-panel-2);
}

.feat-progress .feat-progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: var(--c-accent);
  transition: width 0.2s linear;
}

@media (max-width: 900px) {
  .feat-stage { grid-template-columns: 1fr; }

  .feat-index {
    flex-direction: row;
    min-width: 0;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: 8px;
    padding: 4px 2px 12px;
  }

  .feat-index [role="tab"] .feat-no { white-space: nowrap; }

  .feat-index::-webkit-scrollbar { display: none; }

  .feat-index [role="tab"] {
    flex-shrink: 0;
    padding: 10px 16px;
    border: 1px solid var(--c-line);
    border-radius: var(--r-pill);
  }

  .feat-index [role="tab"]::before { display: none; }

  .feat-index [role="tab"][aria-selected="true"] {
    transform: none;
    border-color: var(--c-accent);
  }
}

/* ---------- 10. 连接状态玻璃卡(Hero 装饰) ---------- */
.link-card {
  background: var(--glass-fill-strong);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-float);
  padding: 22px 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  max-width: 400px;
  width: 100%;
  min-width: 0;
}

.link-card-top {
  display: flex;
  align-items: center;
  gap: 9px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--c-line);
  margin-bottom: 16px;
  color: var(--c-ink);
  font-weight: 600;
}

.link-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-accent);
  flex-shrink: 0;
  animation: dot-breathe 2.2s ease-in-out infinite;
}

.link-card-top .link-proto {
  margin-left: auto;
  font-size: 11px;
  color: var(--c-ink-mute);
  font-weight: 400;
}

.link-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.link-row .link-name {
  width: 92px;
  flex-shrink: 0;
  color: var(--c-ink-mute);
  font-size: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.link-bar {
  flex: 1;
  min-width: 0;
  height: 7px;
  border-radius: 4px;
  background: var(--c-panel-2);
  overflow: hidden;
}

.link-bar i {
  display: block;
  height: 100%;
  border-radius: 4px;
  background: var(--c-ok);
  transition: width 1.1s var(--ease-drift), background 1.1s;
}

.link-bar.is-warn i { background: var(--c-warn); }

.link-row .link-ms {
  width: 56px;
  flex-shrink: 0;
  text-align: right;
  font-size: 12px;
  color: var(--c-ok);
}

.link-row .link-ms.is-warn { color: var(--c-warn); }

.link-card-flow {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--c-line);
}

.link-flow-item { min-width: 0; }

.link-flow-item .flow-label {
  display: block;
  font-size: 11px;
  color: var(--c-ink-mute);
  margin-bottom: 3px;
}

.link-flow-item .flow-val {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-ink);
  font-variant-numeric: tabular-nums;
}

/* ---------- 11. 步骤圆标(教程用) ---------- */
.steps {
  list-style: none;
  counter-reset: mist-step;
  margin: 0;
  padding: 0;
}

.steps > li {
  counter-increment: mist-step;
  position: relative;
  padding: 0 0 28px 56px;
}

.steps > li::before {
  content: counter(mist-step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--c-accent-deep);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.steps > li:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 19px;
  top: 44px;
  bottom: 4px;
  width: 1px;
  background: var(--c-line);
}